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A012667 as a simple table

na(n)
02
1-8
2-159328
3-1254489728
4-20109957303808
5-562928915963168768
6-18213125504516311441408
71487241135313514473061711872

[2,-8,-159328,-1254489728,-20109957303808,
 -562928915963168768,-18213125504516311441408,
 1487241135313514473061711872]